005ec074d6
commit ba2689234be92024e5635d30fe744f4853ad97db upstream.
Some CPUs affected by Spectre-BHB need a sequence of branches, or a
firmware call to be run before any indirect branch. This needs to go
in the vectors. No CPU needs both.
While this can be patched in it would run on all CPUs as there is a
single set of vectors. If the only one part of a big or little combination is
affected the unaffected CPUs have to run the mitigation too.
Create extra vectors that include the sequence. Subsequent patches will
allow affected CPUs to select this set of vectors. Later patches will
modify the loop count to match what the CPU requires.
Change-Id: I83274b2d90e65c1c5bf3b11fb236c08731b83456
Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: James Morse <james.morse@arm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Git-commit: 91429ed04e
Git-repo: https://android.googlesource.com/kernel/common/
Signed-off-by: Kishor Krishna Bhat <quic_kishkris@quicinc.com>
396 lines
13 KiB
C
396 lines
13 KiB
C
/*
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* Copyright (c) 2015, Linaro Limited
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*
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* This software is licensed under the terms of the GNU General Public
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* License version 2, as published by the Free Software Foundation, and
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* may be copied, distributed, and modified under those terms.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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*/
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#ifndef __LINUX_ARM_SMCCC_H
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#define __LINUX_ARM_SMCCC_H
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#include <uapi/linux/const.h>
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/*
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* This file provides common defines for ARM SMC Calling Convention as
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* specified in
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* http://infocenter.arm.com/help/topic/com.arm.doc.den0028a/index.html
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*/
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#define ARM_SMCCC_STD_CALL _AC(0,U)
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#define ARM_SMCCC_FAST_CALL _AC(1,U)
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#define ARM_SMCCC_TYPE_SHIFT 31
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#define ARM_SMCCC_SMC_32 0
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#define ARM_SMCCC_SMC_64 1
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#define ARM_SMCCC_CALL_CONV_SHIFT 30
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#define ARM_SMCCC_OWNER_MASK 0x3F
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#define ARM_SMCCC_OWNER_SHIFT 24
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#define ARM_SMCCC_FUNC_MASK 0xFFFF
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#define ARM_SMCCC_IS_FAST_CALL(smc_val) \
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((smc_val) & (ARM_SMCCC_FAST_CALL << ARM_SMCCC_TYPE_SHIFT))
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#define ARM_SMCCC_IS_64(smc_val) \
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((smc_val) & (ARM_SMCCC_SMC_64 << ARM_SMCCC_CALL_CONV_SHIFT))
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#define ARM_SMCCC_FUNC_NUM(smc_val) ((smc_val) & ARM_SMCCC_FUNC_MASK)
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#define ARM_SMCCC_OWNER_NUM(smc_val) \
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(((smc_val) >> ARM_SMCCC_OWNER_SHIFT) & ARM_SMCCC_OWNER_MASK)
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#define ARM_SMCCC_CALL_VAL(type, calling_convention, owner, func_num) \
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(((type) << ARM_SMCCC_TYPE_SHIFT) | \
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((calling_convention) << ARM_SMCCC_CALL_CONV_SHIFT) | \
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(((owner) & ARM_SMCCC_OWNER_MASK) << ARM_SMCCC_OWNER_SHIFT) | \
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((func_num) & ARM_SMCCC_FUNC_MASK))
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#define ARM_SMCCC_OWNER_ARCH 0
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#define ARM_SMCCC_OWNER_CPU 1
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#define ARM_SMCCC_OWNER_SIP 2
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#define ARM_SMCCC_OWNER_OEM 3
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#define ARM_SMCCC_OWNER_STANDARD 4
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#define ARM_SMCCC_OWNER_TRUSTED_APP 48
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#define ARM_SMCCC_OWNER_TRUSTED_APP_END 49
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#define ARM_SMCCC_OWNER_TRUSTED_OS 50
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#define ARM_SMCCC_OWNER_TRUSTED_OS_END 63
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#define ARM_SMCCC_QUIRK_NONE 0
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#define ARM_SMCCC_QUIRK_QCOM_A6 1 /* Save/restore register a6 */
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#define ARM_SMCCC_VERSION_1_0 0x10000
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#define ARM_SMCCC_VERSION_1_1 0x10001
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#define ARM_SMCCC_VERSION_FUNC_ID \
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ARM_SMCCC_CALL_VAL(ARM_SMCCC_FAST_CALL, \
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ARM_SMCCC_SMC_32, \
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0, 0)
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#define ARM_SMCCC_ARCH_FEATURES_FUNC_ID \
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ARM_SMCCC_CALL_VAL(ARM_SMCCC_FAST_CALL, \
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ARM_SMCCC_SMC_32, \
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0, 1)
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#define ARM_SMCCC_ARCH_WORKAROUND_1 \
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ARM_SMCCC_CALL_VAL(ARM_SMCCC_FAST_CALL, \
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ARM_SMCCC_SMC_32, \
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0, 0x8000)
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#define ARM_SMCCC_ARCH_WORKAROUND_2 \
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ARM_SMCCC_CALL_VAL(ARM_SMCCC_FAST_CALL, \
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ARM_SMCCC_SMC_32, \
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0, 0x7fff)
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#define ARM_SMCCC_ARCH_WORKAROUND_3 \
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ARM_SMCCC_CALL_VAL(ARM_SMCCC_FAST_CALL, \
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ARM_SMCCC_SMC_32, \
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0, 0x3fff)
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#define SMCCC_ARCH_WORKAROUND_RET_UNAFFECTED 1
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#ifndef __ASSEMBLY__
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#include <linux/linkage.h>
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#include <linux/types.h>
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enum arm_smccc_conduit {
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SMCCC_CONDUIT_NONE,
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SMCCC_CONDUIT_SMC,
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SMCCC_CONDUIT_HVC,
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};
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/**
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* arm_smccc_1_1_get_conduit()
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*
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* Returns the conduit to be used for SMCCCv1.1 or later.
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*
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* When SMCCCv1.1 is not present, returns SMCCC_CONDUIT_NONE.
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*/
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enum arm_smccc_conduit arm_smccc_1_1_get_conduit(void);
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/**
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* struct arm_smccc_res - Result from SMC/HVC call
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* @a0-a3 result values from registers 0 to 3
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*/
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struct arm_smccc_res {
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unsigned long a0;
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unsigned long a1;
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unsigned long a2;
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unsigned long a3;
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};
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/**
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* struct arm_smccc_quirk - Contains quirk information
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* @id: quirk identification
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* @state: quirk specific information
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* @a6: Qualcomm quirk entry for returning post-smc call contents of a6
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*/
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struct arm_smccc_quirk {
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int id;
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union {
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unsigned long a6;
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} state;
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};
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/**
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* __arm_smccc_smc() - make SMC calls
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* @a0-a7: arguments passed in registers 0 to 7
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* @res: result values from registers 0 to 3
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* @quirk: points to an arm_smccc_quirk, or NULL when no quirks are required.
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*
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* This function is used to make SMC calls following SMC Calling Convention.
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* The content of the supplied param are copied to registers 0 to 7 prior
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* to the SMC instruction. The return values are updated with the content
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* from register 0 to 3 on return from the SMC instruction. An optional
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* quirk structure provides vendor specific behavior.
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*/
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asmlinkage void __arm_smccc_smc(unsigned long a0, unsigned long a1,
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unsigned long a2, unsigned long a3, unsigned long a4,
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unsigned long a5, unsigned long a6, unsigned long a7,
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struct arm_smccc_res *res, struct arm_smccc_quirk *quirk);
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/**
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* __arm_smccc_hvc() - make HVC calls
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* @a0-a7: arguments passed in registers 0 to 7
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* @res: result values from registers 0 to 3
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* @quirk: points to an arm_smccc_quirk, or NULL when no quirks are required.
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*
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* This function is used to make HVC calls following SMC Calling
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* Convention. The content of the supplied param are copied to registers 0
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* to 7 prior to the HVC instruction. The return values are updated with
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* the content from register 0 to 3 on return from the HVC instruction. An
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* optional quirk structure provides vendor specific behavior.
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*/
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asmlinkage void __arm_smccc_hvc(unsigned long a0, unsigned long a1,
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unsigned long a2, unsigned long a3, unsigned long a4,
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unsigned long a5, unsigned long a6, unsigned long a7,
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struct arm_smccc_res *res, struct arm_smccc_quirk *quirk);
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#define arm_smccc_smc(...) __arm_smccc_smc(__VA_ARGS__, NULL)
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#define arm_smccc_smc_quirk(...) __arm_smccc_smc(__VA_ARGS__)
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#define arm_smccc_hvc(...) __arm_smccc_hvc(__VA_ARGS__, NULL)
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#define arm_smccc_hvc_quirk(...) __arm_smccc_hvc(__VA_ARGS__)
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/* SMCCC v1.1 implementation madness follows */
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#ifdef CONFIG_ARM64
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#define SMCCC_SMC_INST "smc #0"
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#define SMCCC_HVC_INST "hvc #0"
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#elif defined(CONFIG_ARM)
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#include <asm/opcodes-sec.h>
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#include <asm/opcodes-virt.h>
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#define SMCCC_SMC_INST __SMC(0)
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#define SMCCC_HVC_INST __HVC(0)
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#endif
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#define ___count_args(_0, _1, _2, _3, _4, _5, _6, _7, _8, x, ...) x
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#define __count_args(...) \
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___count_args(__VA_ARGS__, 7, 6, 5, 4, 3, 2, 1, 0)
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#define __constraint_write_0 \
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"+r" (r0), "=&r" (r1), "=&r" (r2), "=&r" (r3)
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#define __constraint_write_1 \
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"+r" (r0), "+r" (r1), "=&r" (r2), "=&r" (r3)
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#define __constraint_write_2 \
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"+r" (r0), "+r" (r1), "+r" (r2), "=&r" (r3)
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#define __constraint_write_3 \
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"+r" (r0), "+r" (r1), "+r" (r2), "+r" (r3)
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#define __constraint_write_4 __constraint_write_3
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#define __constraint_write_5 __constraint_write_4
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#define __constraint_write_6 __constraint_write_5
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#define __constraint_write_7 __constraint_write_6
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#define __constraint_read_0
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#define __constraint_read_1
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#define __constraint_read_2
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#define __constraint_read_3
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#define __constraint_read_4 "r" (r4)
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#define __constraint_read_5 __constraint_read_4, "r" (r5)
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#define __constraint_read_6 __constraint_read_5, "r" (r6)
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#define __constraint_read_7 __constraint_read_6, "r" (r7)
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#define __declare_arg_0(a0, res) \
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struct arm_smccc_res *___res = res; \
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register unsigned long r0 asm("r0") = (u32)a0; \
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register unsigned long r1 asm("r1"); \
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register unsigned long r2 asm("r2"); \
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register unsigned long r3 asm("r3")
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#define __declare_arg_1(a0, a1, res) \
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typeof(a1) __a1 = a1; \
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struct arm_smccc_res *___res = res; \
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register unsigned long r0 asm("r0") = (u32)a0; \
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register unsigned long r1 asm("r1") = __a1; \
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register unsigned long r2 asm("r2"); \
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register unsigned long r3 asm("r3")
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#define __declare_arg_2(a0, a1, a2, res) \
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typeof(a1) __a1 = a1; \
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typeof(a2) __a2 = a2; \
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struct arm_smccc_res *___res = res; \
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register unsigned long r0 asm("r0") = (u32)a0; \
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register unsigned long r1 asm("r1") = __a1; \
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register unsigned long r2 asm("r2") = __a2; \
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register unsigned long r3 asm("r3")
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#define __declare_arg_3(a0, a1, a2, a3, res) \
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typeof(a1) __a1 = a1; \
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typeof(a2) __a2 = a2; \
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typeof(a3) __a3 = a3; \
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struct arm_smccc_res *___res = res; \
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register unsigned long r0 asm("r0") = (u32)a0; \
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register unsigned long r1 asm("r1") = __a1; \
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register unsigned long r2 asm("r2") = __a2; \
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register unsigned long r3 asm("r3") = __a3
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#define __declare_arg_4(a0, a1, a2, a3, a4, res) \
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typeof(a4) __a4 = a4; \
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__declare_arg_3(a0, a1, a2, a3, res); \
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register unsigned long r4 asm("r4") = __a4
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#define __declare_arg_5(a0, a1, a2, a3, a4, a5, res) \
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typeof(a5) __a5 = a5; \
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__declare_arg_4(a0, a1, a2, a3, a4, res); \
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register unsigned long r5 asm("r5") = __a5
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#define __declare_arg_6(a0, a1, a2, a3, a4, a5, a6, res) \
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typeof(a6) __a6 = a6; \
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__declare_arg_5(a0, a1, a2, a3, a4, a5, res); \
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register unsigned long r6 asm("r6") = __a6
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#define __declare_arg_7(a0, a1, a2, a3, a4, a5, a6, a7, res) \
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typeof(a7) __a7 = a7; \
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__declare_arg_6(a0, a1, a2, a3, a4, a5, a6, res); \
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register unsigned long r7 asm("r7") = __a7
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#define ___declare_args(count, ...) __declare_arg_ ## count(__VA_ARGS__)
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#define __declare_args(count, ...) ___declare_args(count, __VA_ARGS__)
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#define ___constraints(count) \
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: __constraint_write_ ## count \
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: __constraint_read_ ## count \
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: "memory"
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#define __constraints(count) ___constraints(count)
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/*
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* We have an output list that is not necessarily used, and GCC feels
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* entitled to optimise the whole sequence away. "volatile" is what
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* makes it stick.
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*/
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#define __arm_smccc_1_1(inst, ...) \
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do { \
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__declare_args(__count_args(__VA_ARGS__), __VA_ARGS__); \
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asm volatile(inst "\n" \
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__constraints(__count_args(__VA_ARGS__))); \
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if (___res) \
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*___res = (typeof(*___res)){r0, r1, r2, r3}; \
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} while (0)
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/*
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* arm_smccc_1_1_smc() - make an SMCCC v1.1 compliant SMC call
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*
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* This is a variadic macro taking one to eight source arguments, and
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* an optional return structure.
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*
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* @a0-a7: arguments passed in registers 0 to 7
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* @res: result values from registers 0 to 3
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*
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* This macro is used to make SMC calls following SMC Calling Convention v1.1.
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* The content of the supplied param are copied to registers 0 to 7 prior
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* to the SMC instruction. The return values are updated with the content
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* from register 0 to 3 on return from the SMC instruction if not NULL.
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*/
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#define arm_smccc_1_1_smc(...) __arm_smccc_1_1(SMCCC_SMC_INST, __VA_ARGS__)
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/*
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* arm_smccc_1_1_hvc() - make an SMCCC v1.1 compliant HVC call
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*
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* This is a variadic macro taking one to eight source arguments, and
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* an optional return structure.
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*
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* @a0-a7: arguments passed in registers 0 to 7
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* @res: result values from registers 0 to 3
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*
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* This macro is used to make HVC calls following SMC Calling Convention v1.1.
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* The content of the supplied param are copied to registers 0 to 7 prior
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* to the HVC instruction. The return values are updated with the content
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* from register 0 to 3 on return from the HVC instruction if not NULL.
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*/
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#define arm_smccc_1_1_hvc(...) __arm_smccc_1_1(SMCCC_HVC_INST, __VA_ARGS__)
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/* Return codes defined in ARM DEN 0070A */
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#define SMCCC_RET_SUCCESS 0
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#define SMCCC_RET_NOT_SUPPORTED -1
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#define SMCCC_RET_NOT_REQUIRED -2
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/*
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* Like arm_smccc_1_1* but always returns SMCCC_RET_NOT_SUPPORTED.
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* Used when the SMCCC conduit is not defined. The empty asm statement
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* avoids compiler warnings about unused variables.
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*/
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#define __fail_smccc_1_1(...) \
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do { \
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__declare_args(__count_args(__VA_ARGS__), __VA_ARGS__); \
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asm ("" __constraints(__count_args(__VA_ARGS__))); \
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if (___res) \
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___res->a0 = SMCCC_RET_NOT_SUPPORTED; \
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} while (0)
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/*
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* arm_smccc_1_1_invoke() - make an SMCCC v1.1 compliant call
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*
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* This is a variadic macro taking one to eight source arguments, and
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* an optional return structure.
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*
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* @a0-a7: arguments passed in registers 0 to 7
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* @res: result values from registers 0 to 3
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*
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* This macro will make either an HVC call or an SMC call depending on the
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* current SMCCC conduit. If no valid conduit is available then -1
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* (SMCCC_RET_NOT_SUPPORTED) is returned in @res.a0 (if supplied).
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*
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* The return value also provides the conduit that was used.
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*/
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#define arm_smccc_1_1_invoke(...) ({ \
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int method = arm_smccc_1_1_get_conduit(); \
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switch (method) { \
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case SMCCC_CONDUIT_HVC: \
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arm_smccc_1_1_hvc(__VA_ARGS__); \
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break; \
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case SMCCC_CONDUIT_SMC: \
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arm_smccc_1_1_smc(__VA_ARGS__); \
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break; \
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default: \
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__fail_smccc_1_1(__VA_ARGS__); \
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method = SMCCC_CONDUIT_NONE; \
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break; \
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} \
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method; \
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})
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/* Paravirtualised time calls (defined by ARM DEN0057A) */
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#define ARM_SMCCC_HV_PV_TIME_FEATURES \
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ARM_SMCCC_CALL_VAL(ARM_SMCCC_FAST_CALL, \
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ARM_SMCCC_SMC_64, \
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ARM_SMCCC_OWNER_STANDARD_HYP, \
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0x20)
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#define ARM_SMCCC_HV_PV_TIME_ST \
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ARM_SMCCC_CALL_VAL(ARM_SMCCC_FAST_CALL, \
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ARM_SMCCC_SMC_64, \
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ARM_SMCCC_OWNER_STANDARD_HYP, \
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0x21)
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#endif /*__ASSEMBLY__*/
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#endif /*__LINUX_ARM_SMCCC_H*/
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